Theo and his whole family are theatrical mice. They settled in the theater a long time ago but have so far managed to remain almost invisible to humans—exactly until Theo decided to make a small gift to his sister. However, for this, they had to gnaw a huge hole in the prima ballerina's skirt. And now, it seems, the performance is over. And so are the mice in the theater. At the end of the book, there is a surprise for readers: figures on stands, musicians and their instruments. You can assemble your own orchestra from them and continue playing theater—the theater curtain is shown on one endpaper, the theater's structure in section on the other. For preschool, younger, and middle school ages. About the author: Nina Dashevskaya is a writer and musician, twice winner and multiple-time finalist of "Kniguru"—the main children's and young adult literature contest in the country. About the illustrator: Yulia Sidneva is an artist-illustrator, member of the Moscow Artists' Union, graduate of FGUP Fedorov, participant of Russian and international exhibitions and festivals.